Bear with me. I have a 997 & 798 both are registered with humminbird. They haven't been updated in a year or 2. Both units have 4 new updates listed. If I download the most recent update will all the updates be included? If not do I need to download all 4 updates? For instance on the 997 I have update 1.) 997c si combo (version 5.840) #2 HumminbirdPC (version 4.1.8) #3 son2xtf (version 1.001) and #4 update is son2xtf for Windows Vista(version 1.001) OK do I have to download all of these? Or just the most recent which is the version 5.840 from 8/19/2011 thanks for any help. and sorry such a long post